<?php

/**

 * Zend Framework

 *

 * LICENSE

 *

 * This source file is subject to the new BSD license that is bundled

 * with this package in the file LICENSE.txt.

 * It is also available through the world-wide-web at this URL:

 * http://framework.zend.com/license/new-bsd

 * If you did not receive a copy of the license and are unable to

 * obtain it through the world-wide-web, please send an email

 * to license@zend.com so we can send you a copy immediately.

 *

 * @category   Zend

 * @package    Zend_Pdf

 * @subpackage FileParser

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 * @version    $Id: File.php 20096 2010-01-06 02:05:09Z bkarwin $

 */

/** Zend_Pdf_FileParserDataSource */

require_once 'Zend/Pdf/FileParserDataSource.php';

/**

 * Concrete subclass of {@link Zend_Pdf_FileParserDataSource} that provides an

 * interface to filesystem objects.

 *

 * Note that this class cannot be used for other sources that may be supported

 * by {@link fopen()} (through URL wrappers). It may be used for local

 * filesystem objects only.

 *

 * @package    Zend_Pdf

 * @subpackage FileParser

 * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

 * @license    http://framework.zend.com/license/new-bsd     New BSD License

 */

class Zend_Pdf_FileParserDataSource_File extends Zend_Pdf_FileParserDataSource

{

  /**** Instance Variables ****/

    /**

     * Fully-qualified path to the file.

     * @var string

     */

    protected $_filePath = '';

    /**

     * File resource handle .

     * @var resource

     */

    protected $_fileResource = null;

  /**** Public Interface ****/

  /* Concrete Class Implementation */

    /**

     * Object constructor.

     *

     * Validates the path to the file, ensures that it is readable, then opens

     * it for reading.

     *

     * Throws an exception if the file is missing or cannot be opened.

     *

     * @param string $filePath Fully-qualified path to the file.

     * @throws Zend_Pdf_Exception

     */

    public function __construct($filePath)

    {

        if (! (is_file($filePath) || is_link($filePath))) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception("Invalid file path: $filePath",

                                         Zend_Pdf_Exception::BAD_FILE_PATH);

        }

        if (! is_readable($filePath)) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception("File is not readable: $filePath",

                                         Zend_Pdf_Exception::NOT_READABLE);

        }

        if (($this->_size = @filesize($filePath)) === false) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception("Error while obtaining file size: $filePath",

                                         Zend_Pdf_Exception::CANT_GET_FILE_SIZE);

        }

        if (($this->_fileResource = @fopen($filePath, 'rb')) === false) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception("Cannot open file for reading: $filePath",

                                         Zend_Pdf_Exception::CANT_OPEN_FILE);

        }

        $this->_filePath = $filePath;

    }

    /**

     * Object destructor.

     *

     * Closes the file if it had been successfully opened.

     */

    public function __destruct()

    {

        if (is_resource($this->_fileResource)) {

            @fclose($this->_fileResource);

        }

    }

    /**

     * Returns the specified number of raw bytes from the file at the byte

     * offset of the current read position.

     *

     * Advances the read position by the number of bytes read.

     *

     * Throws an exception if an error was encountered while reading the file or

     * if there is insufficient data to completely fulfill the request.

     *

     * @param integer $byteCount Number of bytes to read.

     * @return string

     * @throws Zend_Pdf_Exception

     */

    public function readBytes($byteCount)

    {

        $bytes = @fread($this->_fileResource, $byteCount);

        if ($bytes === false) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception('Unexpected error while reading file',

                                         Zend_Pdf_Exception::ERROR_DURING_READ);

        }

        if (strlen($bytes) != $byteCount) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception("Insufficient data to read $byteCount bytes",

                                         Zend_Pdf_Exception::INSUFFICIENT_DATA);

        }

        $this->_offset += $byteCount;

        return $bytes;

    }

    /**

     * Returns the entire contents of the file as a string.

     *

     * Preserves the current file seek position.

     *

     * @return string

     */

    public function readAllBytes()

    {

        return file_get_contents($this->_filePath);

    }

  /* Object Magic Methods */

    /**

     * Returns the full filesystem path of the file.

     *

     * @return string

     */

    public function __toString()

    {

        return $this->_filePath;

    }

  /* Primitive Methods */

    /**

     * Seeks the file read position to the specified byte offset.

     *

     * Throws an exception if the file pointer cannot be moved or if it is

     * moved beyond EOF (end of file).

     *

     * @param integer $offset Destination byte offset.

     * @throws Zend_Pdf_Exception

     */

    public function moveToOffset($offset)

    {

        if ($this->_offset == $offset) {

            return;    // Not moving; do nothing.

        }

        parent::moveToOffset($offset);

        $result = @fseek($this->_fileResource, $offset, SEEK_SET);

        if ($result !== 0) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception('Error while setting new file position',

                                         Zend_Pdf_Exception::CANT_SET_FILE_POSITION);

        }

        if (feof($this->_fileResource)) {

            require_once 'Zend/Pdf/Exception.php';

            throw new Zend_Pdf_Exception('Moved beyond the end of the file',

                                         Zend_Pdf_Exception::MOVE_BEYOND_END_OF_FILE);

        }

    }

}